Skip Navigation LinksHome > October 2000 - Volume 10 - Issue 4 > Test–Retest Reliability of Lower Extremity Functional Instab...
Clinical Journal of Sport Medicine:
Clinical Investigations

Test–Retest Reliability of Lower Extremity Functional Instability Measures

Birmingham, Trevor B. PhD

Collapse Box


Objectives: 1) To evaluate the test–retest reliability of lower extremity functional instability measures involving testing situations of varying complexity, and 2) To evaluate the interrelationships among performances observed during these tests and a maximal single-limb forward hop for distance.

Design: A repeated measures design, repeated on two occasions.

Setting: Postural control laboratory.

Participants: Thirty young healthy subjects (23.5 ± 2.0 years).

Main Outcome Measures: Subjects performed single-limb standing balance and forward hop tests on two occasions completed within 1 week and at least 24 hours apart. Standing balance was assessed using a force platform and the following four progressively complex test situations: 1) standing on the stable platform with eyes open, 2) standing on a foam mat placed over the platform with eyes open, 3) standing on the stable platform with eyes closed, and 4) standing on the stable platform after landing from a maximal single-limb forward hop.

Results and Conclusions: Intraclass correlation coefficients were moderate to excellent (0.41 to 0.91) suggesting that the standing balance tests are appropriate for distinguishing among group performances. Standard errors of measurement and associated 95% confidence intervals suggested that a change in an individual's standing balance performance of approximately 10–30% would be necessary in order to confidently state that a true change had occurred. Stronger relationships were observed between hop distance and standing balance tests performed with eyes closed (r = −0.63, p < 0.001) and after landing from a maximal hop (r = −0.53, p = 0.003), suggesting that tests that challenge postural control to a greater extent are more representative of functional performance.

© 2000 Lippincott Williams & Wilkins, Inc.

​​You Tube The CJSM Blog Linked In Facebook Twitter



Article Tools


Article Level Metrics

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.